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| author | Bartosz Golaszewski <bartekgola@gmail.com> | 2015-06-05 10:27:28 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2015-06-07 18:05:34 +0200 |
| commit | 314742747deecd454ae58dfd68be453115ba226c (patch) | |
| tree | 1cec4e02ab66823bd559835f8e9360284882dd49 /miscutils/i2c_tools.c | |
| parent | d291c2fdd5cb8616605c67ecbfb04274fa094242 (diff) | |
| download | busybox-314742747deecd454ae58dfd68be453115ba226c.tar.gz | |
i2cdetect: don't die on addresses already in use by drivers
We can't use i2c_set_slave_addr() in i2cdetect, as we have to check for
EBUSY after calling ioctl(I2C_SLAVE) and print 'UU' on busy addresses
instead of bailing-out.
While we're at it: reorder definitions of local vars in i2cdetect_main().
function old new delta
i2cdetect_main 703 744 +41
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 41/0) Total: 41 bytes
text data bss dec hex filename
826097 4164 9584 839845 cd0a5 busybox_old
826145 4164 9584 839893 cd0d5 busybox_unstripped
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'miscutils/i2c_tools.c')
| -rw-r--r-- | miscutils/i2c_tools.c | 31 |
1 files changed, 19 insertions, 12 deletions
diff --git a/miscutils/i2c_tools.c b/miscutils/i2c_tools.c index 7034dc9a8..d5127ec27 100644 --- a/miscutils/i2c_tools.c +++ b/miscutils/i2c_tools.c @@ -355,6 +355,13 @@ static void i2c_set_pec(int fd, int pec) itoptr(pec ? 1 : 0), "can't set PEC"); } + +static void i2c_set_slave_addr(int fd, int addr, int force) +{ + ioctl_or_perror_and_die(fd, force ? I2C_SLAVE_FORCE : I2C_SLAVE, + itoptr(addr), + "can't set address to 0x%02x", addr); +} #endif /* ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP */ #if ENABLE_I2CGET || ENABLE_I2CSET @@ -390,13 +397,6 @@ static int i2c_dev_open(int i2cbus) return fd; } -static void i2c_set_slave_addr(int fd, int addr, int force) -{ - ioctl_or_perror_and_die(fd, force ? I2C_SLAVE_FORCE : I2C_SLAVE, - itoptr(addr), - "can't set address to 0x%02x", addr); -} - /* Size reducing helpers for xxx_check_funcs(). */ static void get_funcs_matrix(int fd, unsigned long *funcs) { @@ -1281,11 +1281,9 @@ int i2cdetect_main(int argc UNUSED_PARAM, char **argv) opt_F = (1 << 4), opt_l = (1 << 5); const char *const optstr = "yaqrFl"; - int fd, bus_num, i, j, mode = DETECT_MODE_AUTO; - int status; - unsigned first = 0x00, last = 0x77; + int fd, bus_num, i, j, mode = DETECT_MODE_AUTO, status; + unsigned first = 0x00, last = 0x77, opts; unsigned long funcs; - unsigned opts; opt_complementary = "q--r:r--q:" /* mutually exclusive */ "?3"; /* up to 3 args */ @@ -1370,7 +1368,16 @@ int i2cdetect_main(int argc UNUSED_PARAM, char **argv) continue; } - i2c_set_slave_addr(fd, i + j, 0); + status = ioctl(fd, I2C_SLAVE, itoptr(i + j)); + if (status < 0) { + if (errno == EBUSY) { + printf("UU "); + continue; + } + + bb_perror_msg_and_die( + "can't set address to 0x%02x", i + j); + } switch (mode) { case DETECT_MODE_READ: |